feat(cluster-creation): add explicit CPU architecture for GCP

[TheoGrandin74]

Summary

Add explicit CPU architecture handling for GCP workloads and cluster creation:

• indicate ARM support on GCP regions during cluster creation
• expose CPU architecture selection in service resources when the GCP region supports ARM
• send cpu_architecture on service create/edit payloads, mapping DEFAULT to null

[codecov]

Codecov Report

❌ Patch coverage is 32.00000% with 17 lines in your changes missing coverage. Please review.
✅ Project coverage is 46.70%. Comparing base (0e55957) to head (3a2b877).
⚠️ Report is 13 commits behind head on staging.

Files with missing lines	Patch %	Lines
...tings-resources/application-settings-resources.tsx	0.00%	9 Missing ⚠️
...vices/src/lib/cpu-architecture/cpu-architecture.ts	0.00%	4 Missing ⚠️
...luster-creation-flow/step-general/step-general.tsx	70.00%	2 Missing and 1 partial ⚠️
libs/shared/util-services/src/index.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           staging    #2723      +/-   ##
===========================================
+ Coverage    45.22%   46.70%   +1.47%     
===========================================
  Files         1139     1143       +4     
  Lines        23934    24047     +113     
  Branches      6993     7107     +114     
===========================================
+ Hits         10825    11232     +407     
+ Misses       11234    10833     -401     
- Partials      1875     1982     +107     

Flag	Coverage Δ
unittests	46.70% <32.00%> (+1.47%)	⬆️

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